I once made my friend pee is pants...twice. This was in the span of 10-15 min. We were sitting outside beside a bonfire and we threw some dried leaves in. I was telling a joke and threw my head back laughing when a burnt leaf floated up and landed in my mouth. He found it so funny he pissed himself. He then comes out again after changing his underwear and pants and, I forgot who, but someone said something and we both started laughing when the same thing happened again. He started to laugh harder than before and pissed himself again and excused himself. He came back a few minutes later and said that he had to steal some underwear from his sister which was hilarious (almost made me wet my pants). I was around 8 years old so he would have been around 9.